TY - JOUR
T1 - Rotation-induced three-dimensional vorticity in He4 superfluid films adsorbed on a porous glass
AU - Fukuda, M.
AU - Zalalutdinov, M. K.
AU - Kovacik, V.
AU - Minoguchi, T.
AU - Obata, T.
AU - Kubota, M.
AU - Sonin, E. B.
PY - 2005/6/1
Y1 - 2005/6/1
N2 - A detailed study of torsional oscillator experiments under steady rotation up to 6.28rad sec is reported for a He4 superfluid monolayer film formed in 1-μm-pore-diameter porous glass. We discovered a new dissipation peak, whose height changes in proportion to the angular speed. The new peak appears at a temperature lower than the vortex pair unbinding peak observed in the static state. A model of three-dimensional (3D) coreless vortices ("pore vortices") is proposed to explain this additional peak in terms of 2D vortex pair dynamics in the presence of a flow field caused by 3D vortices. The new peak originates from dissipation close to the pore vortex lines, where a large superfluid velocity shifts the vortex pair unbinding dissipation to lower temperature. This explanation is consistent with the observation of nonlinear effects at high oscillation amplitudes.
AB - A detailed study of torsional oscillator experiments under steady rotation up to 6.28rad sec is reported for a He4 superfluid monolayer film formed in 1-μm-pore-diameter porous glass. We discovered a new dissipation peak, whose height changes in proportion to the angular speed. The new peak appears at a temperature lower than the vortex pair unbinding peak observed in the static state. A model of three-dimensional (3D) coreless vortices ("pore vortices") is proposed to explain this additional peak in terms of 2D vortex pair dynamics in the presence of a flow field caused by 3D vortices. The new peak originates from dissipation close to the pore vortex lines, where a large superfluid velocity shifts the vortex pair unbinding dissipation to lower temperature. This explanation is consistent with the observation of nonlinear effects at high oscillation amplitudes.
UR - http://www.scopus.com/inward/record.url?scp=28244478913&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.71.212502
DO - 10.1103/PhysRevB.71.212502
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AN - SCOPUS:28244478913
SN - 1098-0121
VL - 71
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 21
M1 - 212502
ER -